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Title: Effect of Co-Contaminants Uranium and Nitrate on Iodine Remediation

Abstract

The objective of this study is to evaluate the significance of co-contaminants on the migration and transformation of iodine species in the Hanford subsurface environment. These impacts are relevant because remedies that target individual contaminants like iodine, may not only impact the fate and transport of other contaminants in the subsurface, but also inhibit the effectiveness of a targeted remedy. For example, iodine (as iodate) co-precipitates with calcite, and has been identified as a potential remedy because it immobilizes iodine. Since uranium also co-precipitates with calcite in field sediments, the presence of uranium may also inhibit iodine co-precipitation. Another potentially significant impact from co-existing contaminants is iodine and nitrate. The presence of nitrate has been shown to promote biogeochemical reduction of iodate to iodide, thereby increasing iodine species subsurface mobility (as iodide exhibits less sorption). Hence, this study reports on both laboratory batch and column experiments that investigated a) the change in iodate uptake mass and rate of uptake into precipitating calcite due to the presence of differing amounts of uranium, b) the amount of change of the iodate bio-reduction rate due to the presence of differing nitrate concentrations, and c) whether nitrite can reduce iodate in the presence ofmore » microbes and/or minerals acting as catalysts.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1418097
Report Number(s):
PNNL-26955
830403000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY

Citation Formats

Szecsody, James E., Lee, Brady D., Lawter, Amanda R., Qafoku, Nikolla, Resch, Charles T., Baum, Steven R., Leavy, Ian I., and Freedman, Vicky L. Effect of Co-Contaminants Uranium and Nitrate on Iodine Remediation. United States: N. p., 2017. Web. doi:10.2172/1418097.
Szecsody, James E., Lee, Brady D., Lawter, Amanda R., Qafoku, Nikolla, Resch, Charles T., Baum, Steven R., Leavy, Ian I., & Freedman, Vicky L. Effect of Co-Contaminants Uranium and Nitrate on Iodine Remediation. United States. doi:10.2172/1418097.
Szecsody, James E., Lee, Brady D., Lawter, Amanda R., Qafoku, Nikolla, Resch, Charles T., Baum, Steven R., Leavy, Ian I., and Freedman, Vicky L. Fri . "Effect of Co-Contaminants Uranium and Nitrate on Iodine Remediation". United States. doi:10.2172/1418097. https://www.osti.gov/servlets/purl/1418097.
@article{osti_1418097,
title = {Effect of Co-Contaminants Uranium and Nitrate on Iodine Remediation},
author = {Szecsody, James E. and Lee, Brady D. and Lawter, Amanda R. and Qafoku, Nikolla and Resch, Charles T. and Baum, Steven R. and Leavy, Ian I. and Freedman, Vicky L.},
abstractNote = {The objective of this study is to evaluate the significance of co-contaminants on the migration and transformation of iodine species in the Hanford subsurface environment. These impacts are relevant because remedies that target individual contaminants like iodine, may not only impact the fate and transport of other contaminants in the subsurface, but also inhibit the effectiveness of a targeted remedy. For example, iodine (as iodate) co-precipitates with calcite, and has been identified as a potential remedy because it immobilizes iodine. Since uranium also co-precipitates with calcite in field sediments, the presence of uranium may also inhibit iodine co-precipitation. Another potentially significant impact from co-existing contaminants is iodine and nitrate. The presence of nitrate has been shown to promote biogeochemical reduction of iodate to iodide, thereby increasing iodine species subsurface mobility (as iodide exhibits less sorption). Hence, this study reports on both laboratory batch and column experiments that investigated a) the change in iodate uptake mass and rate of uptake into precipitating calcite due to the presence of differing amounts of uranium, b) the amount of change of the iodate bio-reduction rate due to the presence of differing nitrate concentrations, and c) whether nitrite can reduce iodate in the presence of microbes and/or minerals acting as catalysts.},
doi = {10.2172/1418097},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 2017},
month = {Fri Sep 01 00:00:00 EDT 2017}
}

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